桃江取水口处布置纵向底流槽对泥沙淤积的影响

Influence of setting longitudinal underflow trough on sediment deposition at Taojiang River water intake

通过对桃江引水口处设置取水口模型并进行试验,在不同工况下对取水口不同布置方案进行研究,分析纵向底流槽内泥沙平均淤积厚度变化、纵向底流槽内泥沙级配变化及排沙情况。试验结果表明:受进口端过水断面增大影响及取水口前端所在弯道段的横向环流作用,推移质泥沙从进口端不断输移至出口端。平面形态上,取水口口门前泥沙以沙波形式向前推进,取水口口门内泥沙以薄沙层形式淤积。根据试验结论,提出最佳设计方案,并取得较好的效果。

Through setting up a water intake model at Taojiang River water intake and carrying out experiments, different layout schemes of the water intake are studied under different working conditions, and the changes of the average sediment deposition thickness in the longitudinal underflow tank, the changes of the sediment gradation in the longitudinal underflow tank and the situation of sediment discharge are analyzed. The test results show that the bed load sediment is continuously transported from the inlet end to the outlet end due to the increase of the cross section of the inlet end and the lateral circulation of the bend section at the front end of the intake. In plane form, the sediment in front of the intake port advances in the form of sand waves, while the sediment in the intake port deposits in the form of thin sand layers. According to the test results, the best design scheme is put forward and good results are achieved.